I am trying to filter my object for email register

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Hi! I am trying to create an app and trying to filter the handmade database if it has already signed up email.

My Code:
//My Handmade database (empty)

const users = [];

formRegister.post("/register", (req, res) => {

    const user = req.body;

    //If the inputs are empty strings.
    if (validateFunction(user.email, user.password) === 400) {
        res.status(400).send({
            message:"Cant Be Empty!",
            success:false
        });
    } else {

        //if we have already have the email
       if(users.filter(user=>user.email === users.email)){
           res.status(400).send({
            message:"This email already registered!",
            success:false
           });

           //If it is not empty and not already in database,created
       } else{

        users.push(user);
        res.status(200).send(`
        <body style="overflow-y:hidden;">
            <div style="height:100vh;display:flex;justify-content:center;align-items:center;flex-direction:column">
                <h1 style="color:#00C24E font">SUCCESS</h1>
                <h4 style="color:#DC3545">${user.email}</h4>
                <p>Has added to database succesfuly.</p>
                <a href="/getData">Get Other Users</a>
            </div>
        </body>`)
       }
    }

});

I am so confused about the filter part. Anyone can help me, please?

What I have tried:

if(users.filter(user=>user.email === users.email)){

Posted 21-Jan-21 15:45pm

slex1one-Musdy

Updated 25-Jan-21 23:47pm

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Comments

Christian Graus 21-Jan-21 21:59pm

What do you want to do? Have you set breakpoints to see what this code does?

Users is a collection and user in this function will be each user in the collection, not the user you set above

slex1one-Musdy 22-Jan-21 5:06am

The point is, I cant filter my object if the email already exists in it. This Array prototype confused me.

If email already exists in the object it should send 400 status else it should be created and send 200 status.

Christian Graus 22-Jan-21 16:22pm

So this code should iterate through your collection and yes, return a 400 if the email is in it. If it's not working, I'd put that code on a new line, and debug it in Chrome.

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Akbarhussain Patel · Accepted Answer · 2021-01-25T23:47:00

const users = [];
formRegister.post("/register", (req, res) => {
  const currentUser = req.body;

  //If the inputs are empty strings.
  if (validateFunction(currentUser.email, currentUser.password) === 400) {
    res.status(400).send({
      message: "Cant Be Empty!",
      success: false,
    });
  } else {
    const useExists = users.filter((user) => user.email === currentUser.email);
    //if we have already have the email
    if (useExists.length > 0) {
      res.status(400).send({
        message: "This email already registered!",
        success: false,
      });

      //If it is not empty and not already in database,created
    } else {
      users.push(user);
      res.status(200).send(`
	<body style="overflow-y:hidden;">
		<div style="height:100vh;display:flex;justify-content:center;align-items:center;flex-direction:column">
			<h1 style="color:#00C24E font">SUCCESS</h1>
			<h4 style="color:#DC3545">${user.email}</h4>
			<p>Has added to database succesfuly.</p>
			<a href="/getData">Get Other Users</a>
		</div>
	</body>`);
    }
  }
});